regretful

As an adjective regretful is

full of feelings of regret, indulging in regrets.

As an adverb regrettably

is in a manner inspiring or deserving regret.

As an adjective regretful is

full of feelings of regret, indulging in regrets.

As an adjective regretful is

full of feelings of regret, indulging in regrets.

Regretful is a related term of disgruntled.

As adjectives the difference between regretful and disgruntled

is that regretful is full of feelings of regret, indulging in regrets while disgruntled is unhappy; dissatisfied.

As a verb disgruntled is

(obsolete) (disgruntle).

As adjectives the difference between regretful and unhappy

is that regretful is full of feelings of regret, indulging in regrets while unhappy is not happy; sad.

As adjectives the difference between regretful and disappointed

is that regretful is full of feelings of regret, indulging in regrets while disappointed is defeated of expectation or hope; let down.

As a verb disappointed is

past tense of disappoint.

As adjectives the difference between spiteful and regretful

is that spiteful is filled with, or showing, spite; having a desire to vex, annoy, or injure; malignant; malicious while regretful is full of feelings of regret, indulging in regrets.

As adjectives the difference between wistful and regretful

is that wistful is full of yearning or longing while regretful is full of feelings of regret, indulging in regrets.